capillaries
Capillaries.
The area of the head and skull with the greatest concentration of vessels is the scalp. The scalp is highly vascularized to supply blood to the hair follicles and the skin of the head. This rich blood supply helps nourish the hair and provide a protective barrier for the skull.
The color is the blood from broken blood vessels that have ruptured in the impact area
by your vians
Blood from the center of your body can be cooled by dilating superficial blood vessels. As the surface area of these vessels is increased, more heat can be released from the body, lowering blood temperature.
Because they have a larger surface area than the other blood vessels.
contusion
AOrta
Haversian canal
14,000 square feet
It has a lot of blood vessels, and a high surface area to mass ratio.
its helps swelling because it constricts blood vessels in the area and "shrink".